1. The University of Tokyo, Tokyo, Japan;
2. Osaka Medical Center for Cancer and Cardiovascular Disease, Osaka, Japan;
3. Teikyo University, Tokyo, Japan;
4. Nanbugo General Hospital, Niigata, Japan;
5. Niigata Cancer Center Hospital, Niigata, Japan;
6. Kinki University, Osaka, Japan;
7. Nagoya University, Aichi, Japan;
8. Kagoshima University, Kagoshima, Japan;
9. Ibaraki Prefectural Central Hospital, Ibaraki, Japan;
10. Aichi Cancer Center Hospital, Aichi, Japan;
11. Hyogo College of Medicine, Hyogo, Japan;
12. Tohoku University, Miyagi, Japan;
13. Jichi Medical University, Tochigi, Japan;